Double the values of an 2D array

Hello,

I have a 2D array called Numerical_3, I want to double the values of its rows, except the first row. I have attached the picture

This is the code I am using

Numerical_3 = cell2mat(Numerical_2)
P1 = Numerical_3( :,1);
P2 = Numerical_3( :,2)
P1(2:end-1) = 2*P1(2:end-1);
P2(2:end-1) = 2*P2(2:end-1);

But it is not giving me correct results..

I want to double the values from row 2 till end,

does anybody know?

Answer 1

[KSSV]

Let A be your n*2 matrix. To double from second row use:

A(2:end,:) = 2*A(2:end,:) ;